Update published package.json

- Lowers required Node.js version to former LTS 4.x, tested to work.
- Adds keywords so it's easier to search

package/package.json

@@ -3,20 +3,27 @@
   "description": "GOV.UK Frontend contains the code you need to start building a user interface for government platforms and services.",
   "version": "1.0.0",
   "main": "all.js",
+  "sass": "all.scss",
   "engines": {
-    "node": ">=6.0"
+    "node": ">= 4.2.0"
   },
   "author": {
     "name": "GOV.UK Design System Team (Government Digital Service)",
     "email": "design-system-developers@digital.cabinet-office.gov.uk"
   },
-  "sass": "all.scss",
   "repository": {
     "type": "git",
     "url": "https://github.com/alphagov/govuk-frontend.git"
   },
   "bugs": {
     "url": "https://github.com/alphagov/govuk-frontend/issues"
   },
+  "homepage": "https://github.com/alphagov/govuk-frontend#readme",
+  "keywords": [
+    "govuk",
+    "frontend",
+    "design system",
+    "template"
+  ],
   "license": "MIT"
 }